2 Kings 17:12

and they served idols, as to which Jehovah had said to them, Ye shall not do this thing.

Exodus 20:3-5

Thou shalt have no other gods before me.

Exodus 34:14

For thou shalt worship no other God; for Jehovah Jealous is his name is a jealous God;

Leviticus 26:1

Ye shall make yourselves no idols, neither rear you up for yourselves carved image, or statue, nor shall ye set up a figured stone in your land, to bow down unto it; for I am Jehovah your God.

Deuteronomy 4:15-19

And take great heed to your souls (for ye saw no form on the day that Jehovah spoke to you in Horeb from the midst of the fire),

Deuteronomy 4:23-25

Take heed to yourselves lest ye forget the covenant of Jehovah your God, which he made with you, and make yourselves a graven image, the form of anything which Jehovah thy God hath forbidden thee.

Deuteronomy 5:7-9

Thou shalt have no other gods before me.

Deuteronomy 12:4

Ye shall not do so unto Jehovah your God;

Treasury of Scripture Knowledge

Summary

For they served idols, whereof the LORD had said unto them, Ye shall not do this thing.

Bible References

Whereof

Exodus 20:3
Thou shalt have no other gods before me.
Exodus 34:14
For thou shalt worship no other God; for Jehovah Jealous is his name is a jealous God;
Leviticus 26:1
Ye shall make yourselves no idols, neither rear you up for yourselves carved image, or statue, nor shall ye set up a figured stone in your land, to bow down unto it; for I am Jehovah your God.
Deuteronomy 4:19
and lest thou lift up thine eyes to the heavens, and see the sun, and the moon, and the stars, the whole host of heaven, and be drawn away and bow down to them and serve them, which Jehovah thy God hath assigned unto all peoples under the whole heaven.
Deuteronomy 5:7
Thou shalt have no other gods before me.

Ye shall not

Deuteronomy 4:15
And take great heed to your souls (for ye saw no form on the day that Jehovah spoke to you in Horeb from the midst of the fire),
Deuteronomy 12:4
Ye shall not do so unto Jehovah your God;